[The Effect of Multifocal Toric Lens Rotation on Visual Quality].

Area of Science:

• Ophthalmology
• Biomedical Engineering

Background:

• Cataract surgery often involves intraocular lens (IOL) implantation to restore vision.
• Toric multifocal intraocular lenses (T-MIOLs) are designed to correct both astigmatism and presbyopia.
• Lens rotation can impact visual outcomes after T-MIOL implantation.

Purpose of the Study:

• To evaluate and compare the rotational stability of two T-MIOLs: AcrySof IQ ReSTOR Toric SND1Tx and AT LISA toric 909M.
• To assess the effect of T-MIOL rotation on visual quality, including visual acuity, spectacle independence, and patient satisfaction.
• To analyze the incidence and impact of pseudophakic dysphotopsia.

Main Methods:

• A retrospective study of 68 eyes from 34 patients who underwent cataract surgery with T-MIOL implantation.
• Eyes were divided into two groups based on the implanted T-MIOL type (AcrySof or Zeiss).
• T-MIOL position, planned axis, and misalignment were evaluated at one week and six months post-surgery; surgical repositioning was performed if visual quality worsened due to rotation.

Main Results:

• Both T-MIOLs demonstrated significant improvement in uncorrected distance visual acuity (UDVA) post-implantation.
• Surgical rotation of T-MIOLs was performed in 14.7% of eyes, with improved UDVA to 1.0 post-rotation in both groups at six months.
• Rotational stability was achieved (<5 degrees) for surgically rotated lenses within six months; patient satisfaction with visual quality was high.

Conclusions:

• Implantation of both AcrySof ReSTOR Toric SND1Tx and AT LISA toric 909M T-MIOLs is a safe and effective method for cataract patients.
• These T-MIOLs effectively correct corneal astigmatism and provide visual multifocality.
• Prompt surgical repositioning of T-MIOLs is advised if unwanted rotation occurs to ensure optimal visual outcomes.